Pliers



Fig.2 Fig.3

July 14, 1925. 1,546,139

R. F. LEVEQUE Pumas Filea Dane 12- 1923 2 Sheets-Sheet 1 Robert FriricLYEmQ July 14, 1925. 1,546,139

R. F. LEvEQuE PLIERS F ed D c. 1923 2 Sheets-Sheet 2 Frdric Lv q RobertNVENTOR:

. By & Attorney 1 July lei, "i925.

nose-er resonate E; or sr-avnnrrn-onsrnns, FRANCE.-

PLInns.

Application filed December 12-, 1. 2. Serial No. 680,071.

all whom it may gmwgml. I v Be 1t known that" onner Fmior'mlo LEVEQY(Iv-115911 01" the French R ncpubl'ic, residing at St-QuentiirOestres,fusne, in the 5 French Republic, have invented new and the piececlamped.

useful Improvements in or Relating to Flier". ot wl'iich the followingis a specification.

The present invention has for its object pliers tor cl mping purposes,one feature whereof resides in that one oi the two :hes of the pliers,each of which con- 1 rites a jaw one end, and which are hinged upon eachother at the other end, carries toothed sector whilst the other branchcarried an axle-pin around which is pivoted a lever provided with atooth, or portion of a pinion, adapted to engage the said toothedsector. 7

Such pliers offer numerous advantages: the branches cannot be spacedapart at a toe at distance so that the pliers may be held very easily inthe hanu whatever may be the spacing between the jaws. Further, thejaws, even for large openings, make a sufiicient-ly small angle so thatthe clamping is always straight i. e. at right angles with @nthe otherhand, the cla-mpii'ig may be very strong and is substantially the samefrom the innermostpart ol' the aws to the e ds of the same, whichail'ords the use of long jaws without it being prejudicial to the forceof the; pliers. FurtllQ'Z. these pliers can be very simply manufactinenand machined, and comprise a very limited number of pieces.

in the accompanying drawing which shows by way of example various formsof p .ation of the inve'ntionz' mg, 1 is a front view of the pliers in amean positionof opening, the clamping lever being shown in the positionwhich permits of selecting the teeth 01 the sector which are to beengagedwith those of the pinion.

Fig. 2 is a sect-ionon the line Ae-A (Fig.1). f i

Fig. 3 shows the pliers in the position of aximum closing.

Fig. e shows the posi the time when one is about to'proceed with theclamping of-an object, the position of maximum approaching of the twojaws being shown in full and dotted lines.

Figs. and 6 are respectively views similar to Figs. 2 and 3 ot amodified form of pliers according to the invention.

by the use of tion of the pliers at Figs. 7 and 8 are front views of thecorresponding ends of the branches of the modification shownin Figs. 5and 6,. j 1

Figs. 9' and 10 are respectively front view and a side view of thewasher withits stud constituting the fulcrum for the two branches.

In the constructions illustrated in Figs. 1 to a the'pliers comprise twobranches 1" and 2 hinged at? at one end andforming jaws at the other andat 1* and 2. The branch 1 carries a circular toothed sector thaving itscentre at 3. The branch 2 carries an axlepin 5, about which a lever. 6is pivoted, said h lei' erserving. as a handle andprovided with theteeth 7 capable of being engaged with those of the toothed sector a, theportion of a pinion formed by these teeth having the aide-pin 5 as itscentre.

To hold the jaws ina correct position with respect to each other, aflange 8 is preterably made integral with the branch 2 for guiding thesector 4. The jaws may be pro vided with recesses on their inner facefor the clamping of round pieces; they may be also provided with cuttingportions.

In the position in which the lever 6 is raised (Fig. 1), the opening ofthe pliers maybe easily adjusted. When the branches are in the desiredposition (Fig. 4L) the lever 6 is bronght towards the branch 1 by handpressure, the teeth 7 now engage the teeth ofthe sector 4 corresponding.to the same, and the jaws 1 and 2 come to'gether(posit-ion shown inmiXed'lines' in Fig. 4). The

clamping effected is much increased in ratio,

due to the gear ratio between the pinion ortion 7 and the sector l, andto the ratio between the two parts of. the lever 6 on either side of thepin 5. 7

The pliers according to the invention may be easily hand-led althoughthe fulcrum of the jaws is at a relatively. great distance from theobject to be clamped, and the clamping, ot the jaws is effected verynear the object to be clamped, this being afforded the lever 6. Thislever can be engaged at will and inthe direction of the clamping, andits maximum outward position is independent of the spacing of the jaws.

Moreover even for wide openings, the angle between the jaws remainssmall, and this allows of seizing thick pieces in a practically straightposition. The extreme outward position of the lever 6, being independ;

Qil

cut of the spacing of the jaws, may be just what is necessary to thatpliers may be conveniently held in hand. The ratio of the eiiort on thejaws to the eiiort to be exerted on the lever may be made very highWhile at the same time keeping to the usual di mensions for the pliers,and by reason of the great distance of the jaws from their fulcrum, theclamping remains very strong even at the outer ends of the jaws.

In the modification shown in Figs. 5 to the branches 1 and 2 arestraight instead of being curved as in Figs. 1 to 4, which reduces thebulk of the pliers. I

The lower ends of the branches 1 and 2 are flattened and pivoted about apin 10 at one end whereof is riveted a washer 11 (Figs. 9 and 10)carrying a stud 12 engaged in notches 13 and 14: provided respec tivelyin the flat ends of the branches 1 and 2. The notch 13 has a width equalto that of said stud 12, while the notch 1% is wider, which permits thebranches of rotating with regard to each other but limits this rotation,consequently limiting the opening of the pliers so that the widestopening corresponds to the length of the sector 4.

In this modification the flange 15 carried by the branch 2 and servingas a guide for the sector 4 is also used for holding the axle pin, orscrew 5.

Further the end 6 of the lever made as a turn-screw.

Various constructional modifications may be brought to the pliersdescribed without departing from the scope of the invention. Inparticular, the number of teeth 7 of the pinion portion can be asdesired, and may be reduced to one.

A stop-piece may also be provided at the end of the sector 4 forpreventing the opening of the pliers beyond the limit determined bythelength of the said sector.

Having now described my invention What I claim as new and desire tosecure by Letters Patent is:

1. Pliers comprising two branches constituting jaws at one end hingedupon each other at their other ends and disposed over their whole lengthon the same side, relatively to each other, a curved tooth sectorcarried by one of the branches and concentric with the pivot axis ofsaid branches, a pivot pin carried by the other branch, a lever pivotedupon said pivot pin, a portion of pinion provided on said lever andadapted to mesh with the curved toothed sector,

6 may be said toothed sector and said portion of pintuting jaws at oneend'hinged upon each other at their other ends and disposed over theirwhole length on thesame side, rela tively to each other, a curved toothsector carried by one of the branches and concentric with the pivot axisof said branches, a pivot pin carried by the other branch, a leverpivoted upon said pivot pin, a portion of pinion provided on said leverand adapted to mesh with the curved toothed sector, said toothed sectorand said portion of pinion constituting an internal gear, and a flangeprovided on said pivot pin carrying branch and projecting oversaid'toothed sector, thus serving as a guide for the'latter.

3. Pliers comprising two branches constituting jaws at one end hingedupon each other at their other ends and disposed over their length onthe same side, relatively to each other, a curved tooth sector carriedby one of the branches and concentric with the pivot axis of saidbranches, a pivot pin carried by the other branch, a lever pivoted uponsaid pivot pin, a portion of pinion provided on said lever and adaptedto mesh with the curved toothed sector, said toothed sector and saidportion of pinion constituting an internal gear, and a flange providedon said pivot pin carrying branch and projecting over said toothedsector, thus serving as a guide for the latter, said pivot pin extendingthrough and being supported by said flange.

4. Pliers comprising two branches constituting jaws at one end, hingedupon each other at their other ends around a pivot axis and adapted toremove from each other at any desired angle, a notch provided in saidother end of each of said branches, the notch in one branch being ofgreater width than that of the other branch, a. washer secured at oneend of said axle-pin and carrying a stud extending through said notches,a toothed sector carried by one of said branches, a pivot pin carried bythe other branch, a lever pivoted about said pivot pin, a portion ofpinion provided on said lever and adapted to mesh with the curvedtoothed sector, said toothed sector and said portion of pinionconstituting an internal gear.

In testimony whereof I have signed my name to this specification.

ROBERT rnnnnn o' LEvnoU

